Another battery thread

oppy said:
We have 3 proper batteries that do everything that we need connected to a 120 solar panel and the 3 of them probably cost less than one of these new fangled ones !!
Click to expand...
The latest prices for Lithium batteries have them at the same price ,or less, per usable Ah, than LA/AGM. Add in a much greater expected lifespan, and if the vans a keeper it makes a lot of sense changing to Lithium.
 
colinm said:
The latest prices for Lithium batteries have them at the same price ,or less, per usable Ah, than LA/AGM. Add in a much greater expected lifespan, and if the vans a keeper it makes a lot of sense changing to Lithium.
Click to expand...
Van isn't a keeper though...plan for one more year only. 😔
 
REC said:
Anyone had dealings with the battery store...have found a couple of batteries which would fit.,.one lithium also and seems reasonable prices...which worries me! https://batterystore.co.uk/uplus-12...lfp12100-deep-cycle-for-solar-rv-marine-more/
Click to expand...
It's not unusual to see 100ah lithium at £150-£200 so nothing to be suspicious about. You would really need to buy and install a B2B with lithium though as I mentioned before so you need to consider the additional outlay going into a van that you don't intend to keep.
Would you get an extra couple of hundred quid or so if the van had a lithium battery and B2,B already installed?
If no then just buy the largest AGM you can get in and hammer it hard this season without considering how far you're discharging it and pass the lithium or not dilemma onto the new owner.
IF you think you could get the additional costs back (I doubt it but I'm not sales ex spurt) then maybe go for it.
 
merl said:
It's not unusual to see 100ah lithium at £150-£200 so nothing to be suspicious about. You would really need to buy and install a B2B with lithium though as I mentioned before so you need to consider the additional outlay going into a van that you don't intend to keep.
Would you get an extra couple of hundred quid or so if the van had a lithium battery and B2,B already installed?
If no then just buy the largest AGM you can get in and hammer it hard this season without considering how far you're discharging it and pass the lithium or not dilemma onto the new owner.
IF you think you could get the additional costs back (I doubt it but I'm not sales ex spurt) then maybe go for it.
Click to expand...

Would REC not also need a change of 240v charger as well with a lithium profile. I think he said it was a 2018 van so maybe it already has one. Not sure about the MPPT controller.
 
barryd said:
Would REC not also need a change of 240v charger as well with a lithium profile. I think he said it was a 2018 van so maybe it already has one. Not sure about the MPPT controller.
Click to expand...
Not necessarily, I know of someone who initially installed a 100Ah Lithium in a older van with no extra equipment, I think they used Gel settings on charger, after a year of use they installed a B2B and added a specific Lithium charger to get the most out of set up. Although I think he said the maximum charge rate of battery was 50a, never seen one with that, so might have been a BMS that is user adjustable?
 
colinm said:
Not necessarily, I know of someone who initially installed a 100Ah Lithium in a older van with no extra equipment, I think they used Gel settings on charger, after a year of use they installed a B2B and added a specific Lithium charger to get the most out of set up. Although I think he said the maximum charge rate of battery was 50a, never seen one with that, so might have been a BMS that is user adjustable?
Click to expand...

Yep. I know there are accounts of people doing that or just dropping them in and fudging settings but for me personally having spent a year reading up on it, watching various videos from the likes of Victron and Off Grid solutions who of course want to sell you all their products it seemed like a risk not worth taking to me to cut corners and especially if its (in my case) a field where I am not an expert and are counting on the advice of others.

Too many variables involved for something to go wrong. Either do the job properly with all the right kit or don't do it at all. Its how I've worked in IT for decades and this is kind of the same thing IMO.
 
  • Like
Reactions: REC
Thanks all...spoke briefly to the man that did our conversion ( now living off grid in Ireland) ....he agrees b2b and as you say, not worth messing around with if planning to sell. . Apparently the mppt has a lithium switch so wouldn't be an issue with that..but not an issue if we get an ordinary leisure battery. Found one which looks like it will fit

batterystore.co.uk

UPLUS LDC12-105-G27-T 12V 105Ah Deep Cycle AGM Hybrid Gel Battery

Discover the UPLUS 12V 105Ah Deep Cycle Leisure Battery (LDC12-105), a maintenance-free, rechargeable SLA AGM hybrid gel battery designed for optimal performance in solar, RV, backup, trolling motor, marine, and off-grid systems. With advanced valve-regulated technology, this battery offers a...
batterystore.co.uk batterystore.co.uk

Not much more than 90ah but can be discharged more (if I read it right!)
The charger is a numax...this one I think...will I have to get that changed or will it be ok for the above battery?
1745756840827.jpeg
 
REC said:
Thanks all...spoke briefly to the man that did our conversion ( now living off grid in Ireland) ....he agrees b2b and as you say, not worth messing around with if planning to sell. . Apparently the mppt has a lithium switch so wouldn't be an issue with that..but not an issue if we get an ordinary leisure battery. Found one which looks like it will fit

batterystore.co.uk

UPLUS LDC12-105-G27-T 12V 105Ah Deep Cycle AGM Hybrid Gel Battery

Discover the UPLUS 12V 105Ah Deep Cycle Leisure Battery (LDC12-105), a maintenance-free, rechargeable SLA AGM hybrid gel battery designed for optimal performance in solar, RV, backup, trolling motor, marine, and off-grid systems. With advanced valve-regulated technology, this battery offers a...
batterystore.co.uk batterystore.co.uk

Not much more than 90ah but can be discharged more (if I read it right!)
The charger is a numax...this one I think...will I have to get that changed or will it be ok for the above battery?
View attachment 142089
Click to expand...

I asked ChatGTP for you. :D Obviously this is AI but so far I have found it spot on.

"will a numax battery charger model 12100 charge an AGM leisure battery properly. I know some standard 240v chargers will not charge an AGM battery to its full capacity so want to know if this one will"

ChatGPT said:​

Good question — you're right to check carefully because AGM (Absorbent Glass Mat) batteries do need a proper charging profile to reach full charge without damaging them.
The Numax 12100 is actually a smart charger (also branded sometimes as a Numax 12A 12V charger/maintainer), and it's designed for both standard lead-acid and AGM batteries. It provides a multi-stage charging process, including:
  • Bulk charge
  • Absorption
  • Float/maintenance mode
Importantly:
The Numax 12100 will charge an AGM battery properly because it can reach the slightly higher voltage that AGM batteries need during the absorption phase (around 14.4–14.7V depending on the exact battery spec), and then it drops to a safe float voltage (~13.6V), preventing overcharge.

A few things to double-check:​

  • Make sure the battery size (Ah rating) is appropriate for the charger's 12A output. For example, if your AGM leisure battery is something like 70–120Ah, the 12100 is a good fit.
  • Confirm that your specific AGM battery doesn't require a specialized “AGM+” setting (some newer AGM types want even slightly different profiles, but this is rare unless it's a very high-end battery).
Summary:
✅ The Numax 12100 will safely and properly charge a typical AGM leisure battery.
✅ It won't undercharge it like some old-fashioned basic chargers would.
 
When I first fitted my lifepo4 I used gel setting on my mains charger, changed y solar controller to lithium and had the factory fitted split charge relay. Ran like that for over a year, if I was on eau I would turn off mans charger if it got to float.

Batteries are 6 year old now and still perform as the day I got them.

People confuse what you can do with what is ideal a lot I think.

If I was looking today I would just get the cheap eco-worthy batteries. Everyone has to make up their own minds though, its their cash
 
You must log in or register to reply here.

Users who viewed this discussion (Total:73)

Back
Top