Hello Guys

Since installing the solar, and seeing our consumption etc, I believed that the geyser could also be connected to the inverter.

Connected the geyser to the Kodak OG 7.2 yesterday (now the whole DB is connected to Kodak). We found that the Geyser has a 2 kW element in it. We left all the settings on the Geysewise exactly as they were before on ESCOM. (We wanted to run a base test and see what happens)

My setup is as follows:

• Inverter, Kodak OG 7.2, running in SBU mode.
• Batteries, 3 x Kodak FL 5.2, Coms connected to Kodak and charged in OSO mode (solar only) 

Today was not the best "solar" day in Langebaan, but we got through the day fine on a combination of Solar and Battery (see the attached .pdf)

My questions are:

1. Based on the graphs, are the batteries being charged / discharged too much / often ?
2. Will this affect the life of the batteries in the long run ?

 

This was now only day one of testing the setup. Fine tuning and some automation etc will be done in days to come.

Many thanks

 

PS: Now loaded a cleaner .pdf file

  

 

 

SolarAssistant.pdf

Edited September 30, 20223 yr by Wannebe

It doesn't look like the batteries are charging and discharging too much / often. Its likely a consequence of the less than ideal solar conditions today. Your setup should be fine and a 2kw draw on the batteries isnt stressing them too much. Now if that was 4kw then it might be another story

22 minutes ago, mzezman said:

It doesn't look like the batteries are charging and discharging too much / often. Its likely a consequence of the less than ideal solar conditions today. Your setup should be fine and a 2kw draw on the batteries isnt stressing them too much. Now if that was 4kw then it might be another story

Thanks for looking / comment.

Yes, that is why I was happy to find the 2kW element .... never looked at the geyser before as we are in this house only 5 years. Had no need before.

1 hour ago, Wannebe said:

Hello Guys

<SNIP><st "solar" day in Langebaan, but we got through the day fine on a combination of Solar and Battery (see the attached .pdf)

My questions are:

1. Based on the graphs, are the batteries being charged / discharged too much / often ?
2. Will this affect the life of the batteries in the long run ?

If you have Lithium batteries, then daily charge / discharge is fine.
LiFePO 4 batteries are typically rated for 6,000 cycles with a 95% DoD.
6,000 cycles = 16.4 years
I charge mine to 100% SoC daily and discharge to 50-20% SoC.
Below is the 7 day Solar-Assistant Graphs:

If you have Lithium batteries, then daily charge / discharge is fine.
LiFePO 4 batteries are typically rated for 6,000 cycles with a 95% DoD.
6,000 cycles = 16.4 years
I charge mine to 100% SoC daily and discharge to 50-20% SoC.

 

I get it, discharge to 20%, charge back to 100% = 1 x cycle (at least that is how I understand it)

My concern is, because I run my inverter SBU mode, when do all the "topup" to 100% and "small" discharges during the day add up to being an "extra" cycle ?

 

Edited September 29, 20223 yr by Wannebe

Double post

 

Edited September 29, 20223 yr by Wannebe

17 hours ago, Wannebe said:

If you have Lithium batteries, then daily charge / discharge is fine.
LiFePO 4 batteries are typically rated for 6,000 cycles with a 95% DoD.
6,000 cycles = 16.4 years
I charge mine to 100% SoC daily and discharge to 50-20% SoC.

 

I get it, discharge to 20%, charge back to 100% = 1 x cycle (at least that is how I understand it)

My concern is, because I run my inverter SBU mode, when do all the "topup" to 100% and "small" discharges during the day add up to being an "extra" cycle ?

The BMS on Hubble AM-2 tells the inverter to stop charging at 100%. It requires 100% SoC for cell balancing. The BMS prevents charging from 100->95%. This prevents constant top up.

Not sure how other BMS's are programmed.