Quote:
Originally Posted by Chateau_Nomad
Charge ALL batteries to 100%... when the charger stops. Then (as David said) wire all the batteries in parallel to create one large bank.
Issues: Having mismatched battery capacities may prevent one or the other from completely recharging, but they will all eventually discharge... using the full capacity.
Also, depending on how many cycles the older batteries have gone through, they may add to the "fully rechargeable" issue.
Regardless, I'd try this before selling... close to 200Ah is quite a bonus for a backup if all works!
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Quote:
Originally Posted by bherdrick
The new batteries say that they shouldn't be connected in parallel with any ones that are different amperage or different brand.
"Products of different manufacturers cannot be connected in parallel.When the batteries are used in parallel, the voltage must be the same."
https://www.temgot.com/products/temg...s-and-off-grid |
That outdated parallel thinking does not apply to LiFePO4 batteries of the same nominal voltage which each contain their own BMS.
Install the old batteries in their own enclosure with the combined ground attached to the chassis and the combined positive going through an appropriate sized breaker, cable, and disconnect switch. Decide when you want to parallel for added capacity and for charging.
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