Be well
off-grid in Northern Wisconsin for 14 years
off-grid in Northern Wisconsin for 14 years
mark andrews wrote:If you are drawing so much from your forklift batteries that "sag" is a problem--then you are not talking about a system that should ever be set up with just golf cart batteries.
Buy more battery than you think you will need.
For example, I try to never draw my batteries below 94%. They just cycle between 94 and 100 % each day.
That way they should last 20 years.
if you draw them down and discharge them "deeply", then they will only cycle a few thousand times and you will be buying new ones before you know it.
off-grid in Northern Wisconsin for 14 years
mark andrews wrote:
Next, however, is where we have been taught different things and I'd like to know what you think and on what you base that.
I was looking at the often quoted UNM (I think) study suggesting that if you kept the battery in the top 10 % you could expect at least 6,000 charges.
if you use the top 20 % then you only can expect 4,000 charges.
It sounds like you are saying it should be more deeply discharged at times. So, how often do you think it should be more deeply discharged and how deeply are you thinking?
Has anyone studied this?
Lastly, do you have a source of EDTA for batteries. Have you found that helpful when they get older?
mark andrews wrote:
Lastly, do you have a source of EDTA for batteries. Have you found that helpful when they get older?
off-grid in Northern Wisconsin for 14 years
Chris Olson wrote:We have a fairly large battery here, but it can only carry our normal loads for one day from 100% to 50% SOC with no incoming power (58 kWh theoretical capacity - 24 kWh to 50% DoD - 11.5 kWh to 80% DoD = 35.5 kWh useable capacity in actual power delivered to the load).
off-grid in Northern Wisconsin for 14 years
Chris Olson wrote:
Instead of buying a couple new 1300ah 24V forklift batteries you could've bought four Rolls 12CS11P's for $4400 bucks, work the snot out of them and they'll still last 10 years. The CS plates in the 5000-series Rolls batteries are considerably heavier duty than forklift battery. Forklift batteries often have tubular grids and are more prone to stratification from RE chargers that don't put out enough power to properly charge one. The 5000-series Rolls is a dual container battery with "jars" just like your forklift battery, and you can replace individual "jars" if one goes bad over time. The 5000-series Rolls batteries have sailed the Atlantic in fishing trawlers and yachts for close to 30 years and they are THE only kind of batteries most boat captains will buy for their boats, where having a battery failure at sea is not an option.
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