Originally Posted by noelex 77
Smartguage have got a good website, but they are trying to sell an alternative to the battery monitor so read the advice taking this into consideration.....
Someone posted the link to the Smartguage with no other comments. Their site is full of very useful and informed information about all things electrical
- and some very interesting words on trying to measure SoC with Specific Gravity readings. All those who say that SG is the only way to tell if a battery is fully charged should read that.
I have a SmartGuage monitor and a BEP battery monitor which gets more and more inaccurate as the batteries age.
Even with a correctly installed Battery Monitor and shunt all the original settings like Ah capacity, Charge efficiency, and Peukerts constant change with age, as does self-discharge which isn't adjusted for by most BMs as far as I know. So a Battery Monitor is always going to get more and more inaccurate, but a SmartGuage is always getting more and more accurate because it learns what your batteries are doing and adjusts its algorithm but reading the battery voltage over one thousand times a second.
I've seen so many wrongly installed shunts or installations - often caused by extra equipment
that has been added by "engineers" that don't know or can't see a shunt is installed, so it is not surprising that Battery Monitors are not always accurate.
When SmartGuage first came out people said it couldn't work - including the man at Merlin who finally bought the company. His clients in the UK Military were demanding a more accurate BM and are now very happy with the SmartGuage. Recent tests done by Odyssey batteries showed it had an accuracy of 0.1% - too good for most of us.
I agree an ammeter is essential so my recommendation is always that a digital one should be bought along with a SmartGuage. This will give you the best and cheapest Battery Monitor setup.
Back to the original OPs problem - I agree with a previous post that solar panels
that just can't deliver enough current, but can deliver a high voltage, are probably a major cause of a lot of problems. If solar
is your main charging
source disable the auto reset function by setting the volts to reset at above 16+ volts (which it will never do) and reset manually only when you "know" that the batteries are full. The only true test for this is an absorption voltage of 14.4v approx with a current that is 0.5% of the service
bank capacity. There are large (expensive) Solar
Regulators that also have a shunt and act as Battery Monitors so they will be the only type to give you an accurate reset to 100% when fully charged.