Best Settings For Charge Controller - AGM Battery

[vashkoproimage]

Best settings for Renogy charge controller with AGM battery setup. Currently using a Renogy 40 amp controller with 12v AGM setup. Battery's are Eaton pwhr12540w4fr battery's. Some people say not to charge AGM over 14.4 and some say to over charge them. What do you guys think?

Settings I am able to adjust in USER mode are in the image.

Renogy 40 amp charge controller
6 100 Watt Solar panels
6 AGM 135ah battery's
3000 Watt Renogy Inverter

 

[sunshine_eggo]

Overcharging AGM batteries should only be done in accordance with manufacturer's recommendation in most cases. Overcharging AGM usually has a negative outcome.

According to these resources:

https://www.eaton.com/content/dam/eaton/products/backup-power-ups-surge-it-power-distribution/backup-power-ups/ups-batteries-resources/eaton-batteies-spec-sheet-TD162003EN.pdf

https://www.eaton.com/content/dam/eaton/products/backup-power-ups-surge-it-power-distribution/backup-power-ups/ups-batteries-resources/eaton-12v-540w-battery-brochure-PA162003EN.pdf

These appear to be classified as UPS batteries given the website URL at the bottom of the datasheet. This is further evident by only the specification of a float charge in the 13.5-13.8V range and a relatively low 100% DoD cycle life of 260 cycles.

UPS batteries are designed to be held fully charged for very long periods of time with only occasional high current rapid discharges running backup power while some other system comes on line (generator). They are typically recharged slowly via a 13.5-13.8V float which will eventually get them back to full charge after a couple days. They generally have a relatively poor cycle life and are not typically regarded as deep cycle.

This type of battery does not generally perform well in a cyclic application. Can you return them?

Whatever the case, the charge parameters you provided seem reasonable for an AGM battery. IMHO, you should avoid discharges below 70-80% unless absolutely necessary.

 

[time2roll]

Settings look close enough for me. Is that a preset or can each be tailored?

 

[vashkoproimage]

Settings look close enough for me. Is that a preset or can each be tailored?

All those settings can be tailored.

 

[vashkoproimage]

Overcharging AGM batteries should only be done in accordance with manufacturer's recommendation in most cases. Overcharging AGM usually has a negative outcome.

According to these resources:

https://www.eaton.com/content/dam/eaton/products/backup-power-ups-surge-it-power-distribution/backup-power-ups/ups-batteries-resources/eaton-batteies-spec-sheet-TD162003EN.pdf

https://www.eaton.com/content/dam/eaton/products/backup-power-ups-surge-it-power-distribution/backup-power-ups/ups-batteries-resources/eaton-12v-540w-battery-brochure-PA162003EN.pdf

These appear to be classified as UPS batteries given the website URL at the bottom of the datasheet. This is further evident by only the specification of a float charge in the 13.5-13.8V range and a relatively low 100% DoD cycle life of 260 cycles.

UPS batteries are designed to be held fully charged for very long periods of time with only occasional high current rapid discharges running backup power while some other system comes on line (generator). They are typically recharged slowly via a 13.5-13.8V float which will eventually get them back to full charge after a couple days. They generally have a relatively poor cycle life and are not typically regarded as deep cycle.

This type of battery does not generally perform well in a cyclic application. Can you return them?

Whatever the case, the charge parameters you provided seem reasonable for an AGM battery. IMHO, you should avoid discharges below 70-80% unless absolutely necessary.

To me the battery's seem to be performing very well. We used a furnace, 40"tv, fridge, and charging 3 devices over night and still had plenty of power left by morning. In the morning we used a coffee maker and also and tea kennel which are 1500 watts each and still were around 75% battery. By noon the battery's were at 14.4 volts and started float charging at 13.8. We picked these battery's up for only $35 each. For the way they are performing we are more than happy. Just wondering what people are using for settings on AGM battery setup.

 

[time2roll]

All those settings can be tailored.

I would be floating closer to 13.4 and shorten the equalize time to 10 minutes.