About
All feedback (467)
- *****- Feedback left by buyer.Past monthVerified purchaseGreat communication. A pleasure to do business with.
- powerproductzdirect (19544)- Feedback left by buyer.Past monthVerified purchaseHope to deal with you again. Thank you.
- oyquigleyji-9 (2653)- Feedback left by buyer.Past 6 monthsVerified purchaseThank you for an easy, pleasant transaction. Excellent buyer. A++++++.
- stumpyfinningshane (35649)- Feedback left by buyer.Past 6 monthsVerified purchaseHope to deal with you again. Thank you.
- megsatya0 (13295)- Feedback left by buyer.Past 6 monthsVerified purchaseThank you for an easy, pleasant transaction. Excellent buyer. A++++++.
- micktron (6207)- Feedback left by buyer.Past 6 monthsVerified purchaseThank you for your purchase. Please contact us for support/warranty/any issues..
Reviews (1)
16 November 2020
A pseudo hybrid solar power system using an inverter with a built-in mains and MPPT solar charging capability
1 of 1 found this helpful BIT RP-MS 3024E Pure Sine Wave Inverter
This inverter is potentially a very good unit, depending on your application. It has 2 modes of operation that can be set by the user. It works well in the utility (grid feed) priority mode setting as an uninteruptible power supply (UPS). I use mine in the other mode - battery priority with PV (solar) charging because I thought the unit would make a reasonable small scale hybrid solar system. The potential problems relate to battery charging and are outlined below.
My setup consists of:
BIT RP-MS3024E Inverter with 30 amp MPPT solar controller
3 solar panels in a series string, maximum output about 810 watts
4 – AGM 12 volt 100 amp hour batteries wired for 24 volts
Victron Smart Shunt battery monitor
Battery Charging Problem
I believe that lead acid batteries require a full charge periodically for best life expectancy. They are expensive and have a limited cycle life so it is important they are charged correctly. There is a choice of battery chemistry in the set-up menu (including Lithium) and in my case full charge is set to 29.4 volts and float to 27.6 volts. After nearly 2 months of battery logging I noted that the AC and Solar MPPT chargers will only fully charge the battery bank at start up, all subsequent charge cycles are only to float level. Therefore the batteries are only partially charged after each daily discharge. This will have an adverse effect on battery life. As a work around I shut down and re-start the inverter at least every two weeks to fully charge the battery bank.
Another problem with solar charging is the frequent WARNING [97] error 'Inverter fail to communicate with MPPT'. During solar charging the MPPT solar controller will disconnect and re-connect many times during daylight hours for periods of seconds to minutes.
Notes:
Whilst it is useful as a hybrid solar inverter it does not have all the control features necessary for this application. In solar mode, after change-over to utility power at the low battery voltage setting point, only the MPPT solar controller is used to charge the battery bank. It is necessary to change the user settings back to utility mode to start the ac mains charger if overnight charging is required.
I have installed 200 amp hours @ 24 volts of battery power and would consider this the minimum if the intended load power is 1500 watts or more, and is necessary for any length of time in battery mode. For example 2400 watts from a 240 volt supply is a current draw 10 amps. When feeding from a 24 volt supply the current required from the batteries is at least 10 times that figure at about 100 amps. A substantial load on the batteries. If high battery current usage needed then a 48 volt battery bank is a better option
In case of a lengthy grid power outage the unit should operate properly from a sine wave inverter generator, running the load and charging the batteries if solar power is not available. This mode has not been tested.
In summary, it is a well built and robust unit at a reasonable price. The generic user interface is adequate and reasonably well described in the user manual. One necessary feature not included in the unit is an accessible and comprehensive system logging report. In particular logging of battery charge/discharge current/volts if the intended use is as a hybrid solar system. Accurate battery performance logging is important so I installed a Victron battery monitor.
Researching technical data on the unit was not very fruitful with very little information available, except for a couple of pictures of the internals. It appears to be a re-branded Sumry inverter from China. No user manual is available on line or software downloads for system upgrades/bug fixes if necessary. In any case, my inverter does not have the necessary external computer connection, so a user upgrade is not possible.