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Search took 0.00 seconds. Search: Posts Made By: mrm
Forum: Electrical: Batteries, Generators & Solar 23-06-2017, 14:37
Replies: 393
Views: 39,096
Posted By mrm
Re: A way To Save Charging Time

Happy to hear it is working for you :)
Forum: Electrical: Batteries, Generators & Solar 18-05-2017, 08:11
Replies: 393
Views: 39,096
Posted By mrm
Re: A way To Save Charging Time

Yes, but it also depends on battery manufacturer specs / recommendations. Have a look at Maine Sail's post ...
Forum: Electrical: Batteries, Generators & Solar 12-05-2017, 05:03
Replies: 393
Views: 39,096
Posted By mrm
Re: A way To Save Charging Time

Wait a sec.. your bank is 24V?
Missed that piece of info earlier.
In that case, multiply my previously calculated energy demand for charging in acceptance phase (post...
Forum: Electrical: Batteries, Generators & Solar 11-05-2017, 00:38
Replies: 393
Views: 39,096
Posted By mrm
Re: A way To Save Charging Time

My calcs suggest that you will be better off extending morning generator run one hour into the acceptance phase (perhaps run watermaker in the morning?), then 450W of solar should be able to top off...
Forum: Electrical: Batteries, Generators & Solar 10-05-2017, 14:37
Replies: 393
Views: 39,096
Posted By mrm
Re: A way To Save Charging Time

Hey, it was just a fun exercise, nothing complicated :D
Forum: Electrical: Batteries, Generators & Solar 10-05-2017, 13:57
Replies: 393
Views: 39,096
Posted By mrm
Re: A way To Save Charging Time

Did some further research and it appears that while the linear current taper approximation was indeed too crude, I wasn't too far off in my estimates. Using current taper curve from Fig. 1. here:...
Forum: Electrical: Batteries, Generators & Solar 10-05-2017, 09:05
Replies: 393
Views: 39,096
Posted By mrm
Re: A way To Save Charging Time

Yeah, me too.

As I wrote, the linear model is likely wrong, it is probably logarithmic or similar. No time to research it right now.
Forum: Electrical: Batteries, Generators & Solar 10-05-2017, 08:50
Replies: 393
Views: 39,096
Posted By mrm
Re: A way To Save Charging Time

So, given your bank size (377Ah), the bulk/absorption transition point is
37.7A at 14.7V (maybe 14.5V? check your battery spec). The absorption to full is holding voltage (14.7V) till current drops...
Forum: Electrical: Batteries, Generators & Solar 10-05-2017, 07:48
Replies: 393
Views: 39,096
Posted By mrm
Re: A way To Save Charging Time

OK, so roughly, in summer months, consumption during daytime:
fridge+freezer+stereo: 9A * 13V * 6h = 702 Wh


Now the production side. Assuming horizontal mounting with unknown shading one can...
Forum: Electrical: Batteries, Generators & Solar 10-05-2017, 00:06
Replies: 393
Views: 39,096
Posted By mrm
Re: A way To Save Charging Time

While I like simple, oversimplification is not good. How can you be sure of your answer without knowing what the continuous drain on the bank is? Knowing the panel wattage and location gives an...
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