New Rolls Surrette l16's Not holding charge
Sdavison
Registered Users Posts: 2 ✭
I feel like I'm going crazy! I have a 24volt outback 3500 system that is charged by PV. today I finally upgraded from t105 batteries to rolls Surrette l16's (455amp I believe)
They got a full cycle today 4 hour absorb and 1 hour float cycle. The moment the sun went down and with very little load they just started dropping in voltage.
I could use help please. This makes no sense!
Scott
Tagged:
Comments
-
Hi Scott, Welcome to the Forum.
The following Link is for the Surrette Battery Manual:
https://www.rollsbattery.com/wp-content/uploads/2018/01/Rolls_Battery_Manual.pdf
Page 9 describes how to place a new battery bank into service.
Assuming that your new batteries are Flooded Lead Acid (FLA) batteries, you should follow those instructions and charge settings.
In the past, Surrette suggested a Commissioning Charge and EQ for a new bank.
What voltage did you use for Absorb.
Also assume that these are NEW batteries (?).
Later, thanks for any additional info, VicOff Grid - Two systems -- 4 SW+ 5548 Inverters, Surrette 4KS25 1280 AH X2@48V, 11.1 KW STC PV, 4X MidNite Classic 150 w/ WBjrs, Beta KID on S-530s, MX-60s, MN Bkrs/Boxes. 25 KVA Polyphase Kubota diesel, Honda Eu6500isa, Eu3000is-es, Eu2000, Eu1000 gensets. Thanks Wind-Sun for this great Forum. -
Welcome to the forum Scott,
I think these are your batteries:
https://www.solar-electric.com/rolls-surrette-s6-l16-hc-deep-cycle-battery.html
4x 6 volt batteries in series? Any Parallel strings?
Details matter here... What are the charging settings (absorb voltage setpoint, float set point)?
When you had them on 4 hours of absorb, did you take a voltage reading on the battery bus?
Have you compared your settings to the Rolls manual?
https://www.solar-electric.com/lib/wind-sun/surrette-manual.pdf
Rolls tends to specify higher charging voltages for their flooded cell batteries (~30.00 volts @ room temperature, vs 59.50 volts for other brands of FLA batteries).
Do you have a hydrometer? Have you measured and logged all of the cells (as received, when "Full", after corrective Equalization Charge--If needed)?
https://www.solar-electric.com/search/?q=hydrometer
At the end of the absorb cycle (4 hours), what was the charging voltage/current? (End amps from Rolls is around 2-3% of battery bank 20 Hour AH capacity--i.e., 100 AH = 2-3 amps rate of charge near end of absorb cycle)
What is the battery bank voltage when you are "concerned"... Around 25.4 to 25.8 volts is usually "full charge" for a resting FLA battery bank (vs ~29-30 volts when charging and 27.00 volts "float").
Where (roughly--Nearest larger city) is the system installed?
What size solar array do you have (3,500 Watts)?
On a cool/clear spring/fall day, your system would output a typical (best case maximum--a few days a year) around:- 3,500 Watts * 0.77 panel+controller derating * 1/30.00 volts absorb charging = ~90 Amps
Anyway--More questions than answers at this point.
-BillNear San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset -
Sdavison said:I feel like I'm going crazy! I have a 24volt outback 3500 system that is charged by PV. today I finally upgraded from t105 batteries to rolls Surrette l16's (455amp I believe)They got a full cycle today 4 hour absorb and 1 hour float cycle. The moment the sun went down and with very little load they just started dropping in voltage.I could use help please. This makes no sense!Scott
The key question is what voltages are you reading, it would be normal to see a rapid drop from ~27.2V float to ~25.6V without any loads as soon as the array is not capable of passing current to the battery,, any loads wI'll increase the drop.
1500W, 6× Schutten 250W Poly panels , Schneider MPPT 60 150 CC, Schneider SW 2524 inverter, 400Ah LFP 24V nominal battery with Battery Bodyguard BMS
Second system 1890W 3 × 300W No name brand poly, 3×330 Sunsolar Poly panels, Morningstar TS 60 PWM controller, no name 2000W inverter 400Ah LFP 24V nominal battery with Daly BMS, used for water pumping and day time air conditioning.
5Kw Yanmar clone single cylinder air cooled diesel generator for rare emergency charging and welding. -
Y'all are amazing. Just read the manual five times and reset all the parameters on the mate controller.There was no way the batteries got 10 hours on an absorb cycle to get started.I'm actually going to run a 10 hour cycle tonight with the generator and check it with hydrometer in the morning.I'll update you on the progress. Amazing knowledge on this forum.Thanks
Categories
- All Categories
- 221 Forum & Website
- 129 Solar Forum News and Announcements
- 1.3K Solar News, Reviews, & Product Announcements
- 189 Solar Information links & sources, event announcements
- 886 Solar Product Reviews & Opinions
- 254 Solar Skeptics, Hype, & Scams Corner
- 22.3K Solar Electric Power, Wind Power & Balance of System
- 3.5K General Solar Power Topics
- 6.7K Solar Beginners Corner
- 1K PV Installers Forum - NEC, Wiring, Installation
- 2K Advanced Solar Electric Technical Forum
- 5.5K Off Grid Solar & Battery Systems
- 424 Caravan, Recreational Vehicle, and Marine Power Systems
- 1.1K Grid Tie and Grid Interactive Systems
- 651 Solar Water Pumping
- 815 Wind Power Generation
- 621 Energy Use & Conservation
- 608 Discussion Forums/Café
- 302 In the Weeds--Member's Choice
- 74 Construction
- 124 New Battery Technologies
- 108 Old Battery Tech Discussions
- 3.8K Solar News - Automatic Feed
- 3.8K Solar Energy News RSS Feed