How to set up Powerline 100Ah wet leisure batteries with Victron MPPT 100/20 charger

DIY
1

This is a follow on from topic :

Not sure how to properly link back to my original topic :frowning:

Help with setting up the MPPT charger properly for the Poweline wet batteries would be much appreciated.

Regards

PaulM

2

Your first port of call Is to get the datasheet, instructions, manual or charging recommendations for the Powerline batteries that give the manufacturers charging settings. Then start from a generic preset on the charger and edit that in expert mode.

3

First you would need to identify the exact battery that you bought, Tayna apparently has like five different 100Ah batteries called Powerline.

None of them have a manual, so you identify the technology used (flooded lead acid, gel, agm), then use a generic profile for that type.

4

Thanks for the replies. These are my conclusions for a ‘generic’ 100Ah wet lead-acid battery :

Bulk/Absorption stage 28.8v (2 x 14.4v), charge current 20A max, Float stage 27.6v (2 x 13.8v).

Overcharging and gassing will occur above 29.4v (2 x 14.7v).

The Victron ‘Factory default’ is set to these parameters so I’ll leave it as it is for now.

Automatic equalisation is currently turned off in the Victron charger, but set to 32.4v. The recommended voltage for wet lead-acid batteries appears to be ~31.6v (2 x 15.8v), which is a little lower than set. Should I enable automatic equalisation ? If so how often ? The equalisation voltage is above that which will cause gassing so I assume that would be a problem ?

To date I’ve assumed the battery terminal voltage gives an indication of the charge state, 12v being ~50% charge, and cut off the load at this voltage. Some sources suggest this should be 12.4v and 12v indicates the battery is fully discharged ?

Finally some sources suggest the batteries should never be charged below 0degC. Battery acid at ~30% concentration typically freezes at around -20degC, so I don’t see that as a problem even though the batteries are outdoors ?

My aim is to try and extend the battery life if possible, the previous AGM batteries were dead after a little over three years, which was disappointing, and expensive, hence the reason for replacing them with cheaper ‘wet’ batteries.

Any comments would be appreciated.

PaulM