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 > Automatic, smart battery charger?

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full_mosey

Oklahoma

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Posted: 01/11/18 01:40pm Link  |  Quote  |  Print  |  Notify Moderator

I would like to hear some comments and suggestions.

In July 2017, I made some progress on understanding the settings in the MS SS MPPT 15L solar controller. I then modified several settings which move towards a more automatic charging approach. I use two overnight low Voltages(OLV), 12.6 and 12.4, as triggers . These two OLVs drive three charging profiles for the day.

Each AM, the controller executes a start up process(charge_state=4) when the charge_state switches from Disconnected(3) to Bulk(5). This seems to be driven by the appearance of Array Volts. At this time, the day's profile is established.

I set up three profiles.

1. Storage - there is a one hour timed ABS stage before float because the OLV was 12.6 or above.

2. Extended Abs - there is a two hour timed ABS stage before float because the OLV was between 12.6 and 12.4.

3. Cancelled Float - there is unlimited ABS because the OVL was below 12.4.

Now we can see this working in a graph.

[image]

This covers 7 days; Jan 5 - 10 in full and Jan 11 up to 9:40AM.

Jan 5,6 - this is a perfect definition of Storage in good solar; One hour of timed ABS. [emoticon]

Jan 7 - Bad solar day! The controller was stuck in Bulk and never made it to ABS.

Jan 8 - Good solar. The controller AUTOMATICALLY adjusted ABS to 2 hours because OLV dropped below 12.6(not shown).

Jan 9,10 - AUTOMATICALLY Adjusted back to Storage with good solar.

Jan 11 9:40 - I am looking out at the bad weather and predicting a repeat of Jan 7. Tomorrow's forcast is Sunny and the controller will AUTO-correct the same as it did on Jan 8.

Here is a summary of possible profiles since I started logging in May 2017.

Count Profile Avg Min Volts
---------- ------------ -------------
14 Cancel Float 12.26
105 Extend Abs 12.53
99 Storage 12.68

I switched to the SSMPPT15L because the programming features greatly exceed the TRISTAR 45 PWM.

I must shout out to MS for patiently answering many questions, thanks guys!

HTH;
John

* This post was edited 01/11/18 01:46pm by full_mosey *

pianotuna

Regina, SK, Canada

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Posted: 01/11/18 02:05pm Link  |  Quote  |  Print  |  Notify Moderator

Hi John,

Who makes the SSMPPT15L?


Regards, Don
Full Time in a 28 foot Class C, 256 watts solar, 556 amp hours of AGM in two battery banks 12 volt batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

full_mosey

Oklahoma

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Posted: 01/11/18 02:14pm Link  |  Quote  |  Print  |  Notify Moderator

Morningstar SunSaver MPPT 15L

pianotuna

Regina, SK, Canada

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Posted: 01/11/18 02:18pm Link  |  Quote  |  Print  |  Notify Moderator

ty

Lwiddis

El Pueblo de Señora la Reina de los Ángeles

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Posted: 01/11/18 03:10pm Link  |  Quote  |  Print  |  Notify Moderator

Only 15 amps max?


2015 Winnebago 2101DS TT & Chevy Tahoe LTZ, 300 watts WindyNation solar - parallel & MPPT, Trojan T-125s. TALL flagpole for USC & historical flags. Prefer USFS, COE, BLM, NPS, TVA, USF&WS, state & county campgrounds. 14 year Army vet.

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