I'm still experimenting myself, buying ever cheaper boards until I find one that does not work ;)
This is the latest one I've got:
https://www.ebay.co.uk/itm/4-5V-27V-TPA3116-D2-50W-50W-Dual-Channel-Digital-Power-Amplifier-50Wx2-Stereo-UK/324141731568?hash=item4b785a4ef0:g:wooAAOSwNo9b0ewg" rel="nofollow - https://www.ebay.co.uk/itm/4-5V-27V-TPA3116-D2-50W-50W-Dual-Channel-Digital-Power-Amplifier-50Wx2-Stereo-UK/324141731568?hash=item4b785a4ef0:g:wooAAOSwNo9b0ewg
Not had a proper listen to it yet but expect it will be pretty good. Will be trying larger inductors on the board to see if that makes it better.
Note that 27v maximum input voltage. So your batteries at 30v will fry it. Likely you'll need some form of power supply too - like a DC/DC converter with the output set to 26v. That will take in whatever voltage your batteries are sitting/charging at and give out steady power for the amp. One like this:
https://www.ebay.co.uk/itm/400W-DC-DC-Step-Up-Boost-Buck-Voltage-Current-Converter-Power-Supply-Module-UK/224214901303?_trkparms=ispr%3D1&hash=item34343fe237:g:DIUAAOSw9wZe8xJf&amdata=enc%3AAQAFAAACgBaobrjLl8XobRIiIML1V4Imu%252Fn%252BzU5L90Z278x5ickkgCVySCgrNFPU8Iu85TabMKWc7KjlyHL5DMvF5WPes2Zj%252F7lZt3Mjn42K%252Bl%252BqQ5SUQZyIlVydVXeEIkBBgnSnvgvkI552gBUoKKnhax596elwyc3YHJVDajYStvUuftdW%252FLeX%252BBZn8ZKMyMDySqsahm3rveLU%252B5BZL4rkblqY58LJBdcnn%252BScf8%252FsNJaihKB4D4creKifiF2LOAQqX38g2qp2cIULS6WKZAedW9cOtWicwvU5wsuwkfNib%252B5ZQegzGewWRnTkWXy5guFtjio%252BUbpyBwyRv6FRyfsBSYTHgLDiwY0tDEhS3nLioEPyyYWRwmx49tBSDwc2RnVOOUj6khm%252BLMbhtz%252BDE8JDGojm7YcJhg9JpedIfwLJU9B0oC3b8qXS2g9dM0ysSLAzH76eFBpk1Z3oYryo2Xthr081wUHEPPHNEWLHGVhg8lKDxQJmsvb0kZGKNkJjdn3Icc2%252F0oZ6gLbjVoPG%252FMRA85oPfoH1S9qJckZDI%252B4ysvQjADC7kWS99aMYlAaqKgvhM%252F7jFZS2VnoSUPmMtsSy8f1WAzHLAiM4XRbB5m9OmuEXaK6cDTGs461MmSuIT1p%252FIrNOfsDrkkGXTTV0gFK6kkRGb2fqi6jAo2hOzw7NbzyZ2OQVy8muraVhWMyUpe0JOL0%252BqcFNNuCCziIpQxA6MIplbejhGLmzoM4h2Or5MZ3RHKDbheg1EXNcTPLaE7q%252FwQCMyF%252FriSwt1TRhkcHYjDRo2lnZVItLuWeCXmHGC7H2Xi0hoj5Sm%252FEpFQNO22ZT3IuQ2pPSJje%252FcSJgOhSj3QWDRaQ%253D%7Ccksum%3A22421490130326cd2904ae7c4b9a94e149bbfc5e61fb%7Campid%3APL_CLK%7Cclp%3A2334524" rel="nofollow - https://www.ebay.co.uk/itm/400W-DC-DC-Step-Up-Boost-Buck-Voltage-Current-Converter-Power-Supply-Module-UK/224214901303?_trkparms=ispr%3D1&hash=item34343fe237:g:DIUAAOSw9wZe8xJf&amdata=enc%3AAQAFAAACgBaobrjLl8XobRIiIML1V4Imu%252Fn%252BzU5L90Z278x5ickkgCVySCgrNFPU8Iu85TabMKWc7KjlyHL5DMvF5WPes2Zj%252F7lZt3Mjn42K%252Bl%252BqQ5SUQZyIlVydVXeEIkBBgnSnvgvkI552gBUoKKnhax596elwyc3YHJVDajYStvUuftdW%252FLeX%252BBZn8ZKMyMDySqsahm3rveLU%252B5BZL4rkblqY58LJBdcnn%252BScf8%252FsNJaihKB4D4creKifiF2LOAQqX38g2qp2cIULS6WKZAedW9cOtWicwvU5wsuwkfNib%252B5ZQegzGewWRnTkWXy5guFtjio%252BUbpyBwyRv6FRyfsBSYTHgLDiwY0tDEhS3nLioEPyyYWRwmx49tBSDwc2RnVOOUj6khm%252BLMbhtz%252BDE8JDGojm7YcJhg9JpedIfwLJU9B0oC3b8qXS2g9dM0ysSLAzH76eFBpk1Z3oYryo2Xthr081wUHEPPHNEWLHGVhg8lKDxQJmsvb0kZGKNkJjdn3Icc2%252F0oZ6gLbjVoPG%252FMRA85oPfoH1S9qJckZDI%252B4ysvQjADC7kWS99aMYlAaqKgvhM%252F7jFZS2VnoSUPmMtsSy8f1WAzHLAiM4XRbB5m9OmuEXaK6cDTGs461MmSuIT1p%252FIrNOfsDrkkGXTTV0gFK6kkRGb2fqi6jAo2hOzw7NbzyZ2OQVy8muraVhWMyUpe0JOL0%252BqcFNNuCCziIpQxA6MIplbejhGLmzoM4h2Or5MZ3RHKDbheg1EXNcTPLaE7q%252FwQCMyF%252FriSwt1TRhkcHYjDRo2lnZVItLuWeCXmHGC7H2Xi0hoj5Sm%252FEpFQNO22ZT3IuQ2pPSJje%252FcSJgOhSj3QWDRaQ%253D%7Ccksum%3A22421490130326cd2904ae7c4b9a94e149bbfc5e61fb%7Campid%3APL_CLK%7Cclp%3A2334524
------------- Studio45 - Box Builder Commotion Soundsystem -Mobile PA
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